Icon for a display screen



FIG. 1 is a perspective view of an icon for a display screen showing the claimed design;

FIG. 2 is a front elevational view thereof; and,

FIG. 3 is an enlarged front elevational view thereof, the icon is shown separately for clarify of illustration.

The broken-line disclosure of a computer and screen in FIGS. 1 and 2 shows the environment on which the icon is displayed and forms no part of the claimed design. 

The ornamental design for an icon for a display screen, as shown and described. 